CN210536518U - High-voltage auxiliary power supply and high-voltage auxiliary power supply control system - Google Patents
High-voltage auxiliary power supply and high-voltage auxiliary power supply control system Download PDFInfo
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- CN210536518U CN210536518U CN201921782585.1U CN201921782585U CN210536518U CN 210536518 U CN210536518 U CN 210536518U CN 201921782585 U CN201921782585 U CN 201921782585U CN 210536518 U CN210536518 U CN 210536518U
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Abstract
The application provides a high-voltage auxiliary power supply and a high-voltage auxiliary power supply control system, and relates to the technical field of power supply equipment. In the high-voltage auxiliary power supply provided by the embodiment of the application, resistive elements are few, the power consumption of the resistive elements is low, and the high-voltage auxiliary power supply does not have the resistive elements with high power consumption, so that the working efficiency of the circuit is high, and the high-voltage auxiliary power supply is suitable for wide-range input voltage. When the high-voltage auxiliary power supply is applied to the high-voltage power supply, the existing voltage-sharing terminal of the high-voltage power supply can be used as the input of the clamping circuit, the high-voltage auxiliary power supply can be realized only by adding a small number of elements to the high-voltage power supply, the circuit is simple to modify, and the circuit modification cost is low. The voltage born by the first power device and the second power device is lower, and the device with lower voltage grade can be selected, so that the realization cost of the high-voltage auxiliary power supply is further reduced.
Description
Technical Field
The application relates to the field of power supply equipment, in particular to a high-voltage auxiliary power supply and a high-voltage auxiliary power supply control system.
Background
In the power supply equipment with medium and high power levels, the auxiliary power supply is used for supplying stable electric energy to auxiliary circuits such as control, sampling, protection, logic, drive and the like in the system. After the equipment is powered on, the auxiliary power supply can work at the first time to prepare for auxiliary power supply of the system. The auxiliary power supply is characterized by a small power level, and generally has an output of several watts to dozens of watts. The flyback topology is widely used for an auxiliary power supply because of its advantages of isolation, fewer components, simple circuit, and the like. In the field of high-voltage power supply conversion, such as 550V high-voltage direct-current input voltage after three-phase alternating current uncontrolled rectification, a traditional flyback topology has higher primary side emission voltage and peak voltage, and the voltage stress of a switching device can reach more than 1000V. Such high voltage levels result in difficult power device type selection, higher cost and poorer auxiliary power supply performance.
Disclosure of Invention
In view of the above, the present application provides a high voltage auxiliary power supply and a high voltage auxiliary power supply control system.
The technical scheme provided by the application is as follows:
a high voltage auxiliary power supply comprising: the clamping circuit comprises a second anode input end, a clamping diode, a driving input end, a first diode, a second diode, a first voltage-regulator tube, a first power device, a second voltage-regulator tube, a third voltage-regulator tube, a second power device, a first resistor, a negative electrode input end and a fourth voltage-regulator tube, wherein:
the anode of the clamping diode is connected with the second positive electrode input end, and the cathode of the clamping diode is connected with the primary winding of the transformer;
the driving input end is used for receiving a driving signal so as to enable the first power device or the second power device to be switched on or switched off;
the anode of the first diode is connected with the driving input end, the cathode of the first diode is connected with the anode of the first voltage-stabilizing tube, and the cathode of the first voltage-stabilizing tube is connected with the control end of the first power device;
the control end of the first power device is also connected with the anode of a second diode and the cathode of a second voltage-stabilizing tube, the cathode of the second diode is connected with the cathode of a third voltage-stabilizing tube, the anode of the second voltage-stabilizing tube is connected with the first potential end of the second power device, and the anode of the third voltage-stabilizing tube is connected with the second anode input end;
the control end of the second power device is connected with the driving input end through the first resistor, the second potential end of the second power device is connected with the negative electrode input end, the anode of the fourth voltage-regulator tube is connected with the first potential end of the second power device, and the cathode of the fourth voltage-regulator tube is connected with the cathode of the first diode;
and a first potential end of the first power device is connected with a primary winding of the transformer, and a second potential end of the first power device is connected with a first potential end of the second power device.
Further, the clamping circuit further comprises a first capacitor, and the first capacitor is connected with the third voltage regulator tube in parallel.
Further, the high-voltage auxiliary power supply further includes: and the rectification output circuit is connected with the secondary winding of the transformer and is used for outputting rectified current to external equipment.
Further, the rectified output circuit includes: output diode, output capacitance and output resistance, wherein:
the anode of the output diode is connected with the secondary winding of the transformer, the cathode of the output diode is connected with one end of the output resistor, the other end of the output resistor is connected with the secondary winding of the transformer, the output capacitor is connected with the output resistor in parallel, and the anode of the output diode is used as the output end of the rectification output circuit.
Further, the high-voltage auxiliary power supply further comprises a voltage-sharing circuit, and the voltage-sharing circuit comprises a second resistor, a third resistor, a second capacitor and a third capacitor; wherein:
one end of the second resistor is connected with the first positive input end, the other end of the second resistor is connected with the second positive input end, and the second capacitor is connected with the second resistor in parallel;
one end of the third resistor is connected with the second positive input end, the other end of the third resistor is connected with the negative input end, and the third capacitor is connected with the third resistor in parallel.
Further, the resistance value of the second resistor is equal to the resistance value of the third resistor, and the capacitance value of the second capacitor is equal to the capacitance value of the third capacitor, so that the voltage value of the second positive input end is equal to half of the voltage value of the first positive input end.
The application also provides a high-voltage auxiliary power supply control system, including the aforesaid high-voltage auxiliary power supply, and with the control chip that drive input connects, control chip is used for generating drive signal, in order to control first power device or second power device switch on or turn off.
Further, the clamping circuit further comprises a first capacitor, and the first capacitor is connected with the third voltage regulator tube in parallel.
Further, the high-voltage auxiliary power supply further includes: and the rectification output circuit is connected with the secondary winding of the transformer and is used for outputting rectified current to external equipment.
Further, the rectified output circuit includes: output diode, output capacitance and output resistance, wherein:
the anode of the output diode is connected with the secondary winding of the transformer, the cathode of the output diode is connected with one end of the output resistor, the other end of the output resistor is connected with the secondary winding of the transformer, the output capacitor is connected with the output resistor in parallel, and the anode of the output diode is used as the output end of the rectification output circuit.
In the high-voltage auxiliary power supply provided by the embodiment of the application, resistive elements are few, the power consumption of the resistive elements is low, and the high-voltage auxiliary power supply does not have the resistive elements with high power consumption, so that the working efficiency of the circuit is high, and the high-voltage auxiliary power supply is suitable for wide-range input voltage. When the high-voltage auxiliary power supply is applied to the high-voltage power supply, the existing voltage-sharing terminal of the high-voltage power supply can be used as the input of the clamping circuit, the high-voltage auxiliary power supply can be realized only by adding a small number of elements to the high-voltage power supply, the circuit is simple to modify, and the circuit modification cost is low. The voltage born by the first power device and the second power device is lower, and the device with lower voltage grade can be selected, so that the realization cost of the high-voltage auxiliary power supply is further reduced.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a circuit schematic diagram of a conventional high-voltage auxiliary power supply according to an embodiment of the present disclosure.
Fig. 2 is a circuit schematic diagram of a high-voltage auxiliary power supply according to an embodiment of the present disclosure.
Fig. 3 is another circuit diagram of a high-voltage auxiliary power supply according to an embodiment of the present disclosure.
Fig. 4 is a circuit schematic diagram of a high-voltage auxiliary power control system according to an embodiment of the present disclosure.
Icon: 10-high voltage auxiliary power supply; 100-a transformer; 200-a clamp circuit; 300-an output circuit; 400-voltage-sharing circuit; and 20, controlling the chip.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the prior art, in order to obtain a high-voltage auxiliary power supply, a circuit as shown in fig. 1 may be generally adopted, where VIN is a positive input voltage, and GND is a negative input voltage. The power devices Q10 and Q20 and the control signal DRIVE form a StackFET structure in which a MOSFET having a withstand voltage of up to 600V can be selected as the power device. In such a circuit configuration, when a DRIVE signal is generated at the DRIVE terminal, the drain of Q20 DRIVEs the source of Q10, while the drain of Q10 DRIVEs the primary of the transformer. When the DRIVE terminal generates a turn-off signal, the drain of the Q10 is limited to a certain voltage by the voltage regulators D40, D50 and D60. D40, D50 and D60 can adopt a voltage regulator tube with the voltage regulation value of 150V, Q10 can be clamped at 450V, and the maximum combined peak drain voltage of Q10 and Q20 can be expanded to 1050V. Resistors R10, R20, R30 may provide turn-on charging for the gate of Q10, R40 damping high frequency oscillations. During the operation of the circuit shown in fig. 1, the gate of the power device is mainly driven by the charges stored in the capacitors D40, D50 and D60, and the amplitude of the driving voltage from the gate to the source of the Q10 is limited by the voltage regulator D30.
In the auxiliary power supply circuit, a plurality of resistance elements such as R10, R20, R30, R40, and R70 exist, and a large current flows through these resistance elements during circuit operation, resulting in a large resistive loss. When the circuit is applied to a scene with higher input voltage, the resistive loss can rise sharply, so that the practicability of the circuit is improved.
In view of this, the present embodiment provides a high-voltage auxiliary power supply 10, as shown in fig. 2, including: transformer 100 and clamp circuit 200.
The clamping circuit 200 is configured to clamp a voltage at one side of a primary winding of the transformer 100, and the primary winding of the transformer 100 is connected to an external power source through a first positive input terminal. The embodiments of the present application do not limit the specific parameters of the transformer 100.
The clamping circuit 200 comprises a second anode input end, a clamping diode 8, a driving input end, a first diode 6, a second diode 9, a first voltage-regulator tube 11, a first power device, a second voltage-regulator tube 10, a third voltage-regulator tube 2, a second power device, a first resistor, a cathode input end and a fourth voltage-regulator tube 12.
The anode of the clamping diode 8 is connected to the second positive input terminal, and the cathode of the clamping diode is connected to the primary winding of the transformer 100. The driving input end is used for receiving a driving signal so as to enable the first power device or the second power device to be switched on or switched off. The anode of the first diode 6 is connected with the driving input end, the cathode of the first diode 6 is connected with the anode of the first voltage-stabilizing tube 11, and the cathode of the first voltage-stabilizing tube 11 is connected with the control end of the first power device 1.
The control end of the first power device 1 is further connected with the anode of a second diode 9 and the cathode of a second voltage-regulator tube 10, the cathode of the second diode 9 is connected with the cathode of a third voltage-regulator tube 2, the anode of the second voltage-regulator tube 10 is connected with the first potential end of the second power device 2, and the anode of the third voltage-regulator tube 2 is connected with the second positive electrode input end.
The control end of the second power device is connected with the driving input end through the first resistor, the second potential end of the second power device is connected with the negative electrode input end, the anode of the fourth voltage-stabilizing tube is connected with the first potential end of the second power device, and the cathode of the fourth voltage-stabilizing tube is connected with the cathode of the first diode.
A first potential end of the first power device is connected with the primary winding of the transformer 100, and a second potential end of the first power device is connected with a first potential end of the second power device.
In the embodiment of the present application, the second positive input terminal may be connected to the first positive input terminal through the voltage equalizing circuit 400, and the voltage value of the second positive input terminal may be one half of the voltage value of the first positive input terminal. It can be understood that, in the actual use process, the high-voltage power circuit where the high-voltage auxiliary power supply 10 is located generally adopts a topology structure such as a full-bridge circuit or a half-bridge circuit connected in series on the primary side, so that the high-voltage power circuit itself already has a voltage-sharing terminal, and the voltage of the voltage-sharing terminal is one half of the voltage value of the first positive input terminal. The second positive input terminal may not be connected to the first positive input terminal through the voltage equalizing circuit 400, but may be directly connected to the voltage equalizing terminal, so as to realize the input of the second positive input terminal.
In the circuit, when a driving signal is input into the circuit from the driving input terminal, the second power device Q2 is turned on, and at the same time, the driving signal passes through the first diode D6 and the first voltage regulator D11 to generate a source driving signal, so as to drive the first power device Q1 to be turned on, and the primary side of the transformer 100 starts to store energy. When the driving input end inputs a turn-off signal, the second power device Q2 is turned off, the turn-off voltage of the second power device Q2 is conducted in the forward direction through the second voltage regulator tube D10 and the second diode D9, and the voltage of the transformer 100 can be clamped to the sum of the voltage of the third voltage regulator tube D2 and the voltage of the second positive electrode input end. The remaining spike voltage and reflected voltage when the second power device Q2 is turned off can be assumed by the first power device Q1. The first diode D6, the first regulator D11 and the fourth regulator D12 can prevent the first power device and the second power device from reverse overvoltage breakdown.
The clamping circuit 200 further includes a first capacitor connected in parallel with the third voltage regulator tube.
The high-voltage auxiliary power supply 10 further includes: and a rectification output circuit 300, wherein the rectification output circuit 300 is connected with the secondary winding of the transformer 100, and is used for outputting rectified current to an external device.
The rectified output circuit 300 includes: output diode, output capacitance and output resistance, wherein:
the anode of the output diode is connected to the secondary winding of the transformer 100, the cathode of the output diode is connected to one end of the output resistor, the other end of the output resistor is connected to the secondary winding of the transformer 100, the output capacitor is connected in parallel to the output resistor, and the anode of the output diode is used as the output end of the rectification output circuit 300.
As shown in fig. 3, the high-voltage auxiliary power supply 10 further includes a voltage-sharing circuit 400, where the voltage-sharing circuit 400 includes a second resistor, a third resistor, a second capacitor, and a third capacitor; wherein:
one end of the second resistor is connected with the first positive input end, the other end of the second resistor is connected with the second positive input end, and the second capacitor is connected with the second resistor in parallel;
one end of the third resistor is connected with the second positive input end, the other end of the third resistor is connected with the negative input end, and the third capacitor is connected with the third resistor in parallel.
The resistance value of the second resistor is equal to that of the third resistor, and the capacitance value of the second capacitor is equal to that of the third capacitor, so that the voltage value of the second positive input end is equal to half of the voltage value of the first positive input end.
As shown in fig. 4, the present application further provides a high-voltage auxiliary power supply control system, which includes the above-mentioned high-voltage auxiliary power supply 10, and a control chip 20 connected to the driving input terminal, where the control chip 20 is configured to generate a driving signal to control the first power device or the second power device to turn on or off.
Further, the clamping circuit 200 further includes a first capacitor, and the first capacitor is connected in parallel with the third regulator tube.
Further, the high-voltage auxiliary power supply 10 further includes: and a rectification output circuit 300, wherein the rectification output circuit 300 is connected with the secondary winding of the transformer 100, and is used for outputting rectified current to an external device.
Further, the rectification output circuit 300 includes: output diode, output capacitance and output resistance, wherein:
the anode of the output diode is connected to the secondary winding of the transformer 100, the cathode of the output diode is connected to one end of the output resistor, the other end of the output resistor is connected to the secondary winding of the transformer 100, the output capacitor is connected in parallel to the output resistor, and the anode of the output diode is used as the output end of the rectification output circuit 300.
To sum up, in the high-voltage auxiliary power supply 10 provided in the embodiment of the present application, the resistive elements are few, the power consumption of the resistive elements is very low, and the high-voltage auxiliary power supply 10 does not have a resistive element with large power consumption, so that the working efficiency of the circuit is high, and the high-voltage auxiliary power supply is suitable for input voltages in a wide range. When the high-voltage auxiliary power supply 10 is applied to a high-voltage power supply, the existing voltage-sharing terminal of the high-voltage power supply can be used as the input of the clamping circuit 200, the high-voltage auxiliary power supply 10 in the application can be realized only by adding a small number of elements to the high-voltage power supply, the circuit is simple to modify, and the circuit modification cost is low. The voltage born by the first power device and the second power device is lower, and the device with lower voltage grade can be selected, so that the realization cost of the high-voltage auxiliary power supply 10 is further reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A high voltage auxiliary power supply, comprising: the clamping circuit comprises a second anode input end, a clamping diode, a driving input end, a first diode, a second diode, a first voltage-regulator tube, a first power device, a second voltage-regulator tube, a third voltage-regulator tube, a second power device, a first resistor, a negative electrode input end and a fourth voltage-regulator tube, wherein:
the anode of the clamping diode is connected with the second positive electrode input end, and the cathode of the clamping diode is connected with the primary winding of the transformer;
the driving input end is used for receiving a driving signal so as to enable the first power device or the second power device to be switched on or switched off;
the anode of the first diode is connected with the driving input end, the cathode of the first diode is connected with the anode of the first voltage-stabilizing tube, and the cathode of the first voltage-stabilizing tube is connected with the control end of the first power device;
the control end of the first power device is also connected with the anode of a second diode and the cathode of a second voltage-stabilizing tube, the cathode of the second diode is connected with the cathode of a third voltage-stabilizing tube, the anode of the second voltage-stabilizing tube is connected with the first potential end of the second power device, and the anode of the third voltage-stabilizing tube is connected with the second anode input end;
the control end of the second power device is connected with the driving input end through the first resistor, the second potential end of the second power device is connected with the negative electrode input end, the anode of the fourth voltage-regulator tube is connected with the first potential end of the second power device, and the cathode of the fourth voltage-regulator tube is connected with the cathode of the first diode;
and a first potential end of the first power device is connected with a primary winding of the transformer, and a second potential end of the first power device is connected with a first potential end of the second power device.
2. The high voltage auxiliary power supply of claim 1, wherein said clamping circuit further comprises a first capacitor connected in parallel with said third regulator tube.
3. The high voltage auxiliary power supply according to claim 1, further comprising: and the rectification output circuit is connected with the secondary winding of the transformer and is used for outputting rectified current to external equipment.
4. The high-voltage auxiliary power supply according to claim 3, wherein said rectified output circuit comprises: output diode, output capacitance and output resistance, wherein:
the anode of the output diode is connected with the secondary winding of the transformer, the cathode of the output diode is connected with one end of the output resistor, the other end of the output resistor is connected with the secondary winding of the transformer, the output capacitor is connected with the output resistor in parallel, and the anode of the output diode is used as the output end of the rectification output circuit.
5. The high voltage auxiliary power supply according to claim 1, further comprising a voltage equalizing circuit comprising a second resistor, a third resistor, a second capacitor, and a third capacitor; wherein:
one end of the second resistor is connected with the first positive input end, the other end of the second resistor is connected with the second positive input end, and the second capacitor is connected with the second resistor in parallel;
one end of the third resistor is connected with the second positive input end, the other end of the third resistor is connected with the negative input end, and the third capacitor is connected with the third resistor in parallel.
6. The auxiliary power supply according to claim 5, wherein the second resistor has a resistance equal to that of the third resistor, and the second capacitor has a capacitance equal to that of the third capacitor, so that the voltage at the second positive input terminal is equal to half of the voltage at the first positive input terminal.
7. A high-voltage auxiliary power supply control system, comprising the high-voltage auxiliary power supply of any one of claims 1 to 6, and a control chip connected to the driving input end, wherein the control chip is configured to generate a driving signal to control the first power device or the second power device to be turned on or off.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921782585.1U CN210536518U (en) | 2019-10-22 | 2019-10-22 | High-voltage auxiliary power supply and high-voltage auxiliary power supply control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921782585.1U CN210536518U (en) | 2019-10-22 | 2019-10-22 | High-voltage auxiliary power supply and high-voltage auxiliary power supply control system |
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| CN210536518U true CN210536518U (en) | 2020-05-15 |
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